Our linear astigmatism-free confocal off-axis collimator comprises two off-axis mirrors and one flat mirror with an aperture size of 73 mm and a focal length of 1200 mm. The off-axis mirrors, along with all other opto-mechanical parts, will be fabricated from the same material, such as aluminum alloy 6061-T6. This concept inherently creates an athermalized structure, meaning the entire system expands or contracts by the same amount as the thermal coefficient of expansion, ensuring that the image remains consistently in focus. We approached this collimator’s design as if it were an astronomical telescope, reversing the optical path directions, and conducted tolerance analysis using Optic Studio (ZEMAX) to define the opto-mechanical design requirements. The collimator’s target or telescope imaging sensor size is 4 × 4 mm, with a required imaging resolution of 13.7 cycles/mm at a wavelength of 750 nm. To achieve this, we divided the full field (4 × 4 mm) into 3 × 3 subfields, ensuring that the average Modulation Transfer Function (MTF) value exceeds 10%. We performed Monte-Carlo Simulations 5000 times to determine tolerance ranges with a 90% confidence level. Furthermore, we conducted stray light analysis for our off-axis collimator design. In comparison to typical on-axis Cassegrain designs, where baffles block some parts of the target rays and reduce intensity, our designed confocal off-axis collimator accommodates baffles without obstructing any light from the target.
The optical design of a 400 mm-aperture, f/3, three-mirror freeform telescope for the MESSIER surveyor mission is presented. PhoSim PSF (Point Spread Function) simulations of the linear astigmatism-free optical design and mirror surfaces’ microroughness modeling indicate good manufacturability.
The conventional on-axis reflective systems suffer from a diffraction effect on the Point Spread Function (PSF) due to the secondary mirror obscuration. Meanwhile, the unobscured off-axis reflective systems’ imaging performance may be impacted by linear astigmatism aberration. The Linear Astigmatism Free-Three Mirror System (LAF-TMS) is a confocal off-axis reflective system that eliminates linear astigmatism and enables a wide Field of View (FoV). We present an enhanced design of LAF-TMS, called ”wide-wide”, which has an aperture of D=40mm, an effective focal length of f=75mm, and a wide FoV of 8.25°(Horizontal) × 6.21°(V ertical) combined with a wide spectral bandwidth capability suitable for Unmanned Aerial Vehicle (UAV) applications. To evaluate the performance of this compact and fast optical system design, we use the Photon Simulator (PhoSim) to model physically accurate PSF under different conditions of the mirror surface, mechanical environment, and atmosphere. As a benchmark, we compare and analyze the PhoSim PSF results with other ray tracing software such as Zemax and CodeV. Additionally, PhoSim is capable of simulating infrared spectral imaging cases with a user-defined Spectral Energy Distribution (SED), intensity, and emissivity of each pixel. The comprehensive simulation results demonstrate the high performance of the LAF-TMS with a wide-wide FoV and multispectral capabilities.
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